I have a here4 connected to a raspberry pi 4 through a spi/can hat. I tried to update to the latest firmware from here https://github.com/CubePilot/GNSSPeriph-release/releases/tag/v1.14.4, using DroneCAN GUI Tool, i restarted the node after and then the device is stuck in white lights, i already checked other similar topics on the forum. I thank you in advance for any insights.
SOLUTION: (I’m posting it as an answer because i can’t find an option for editing my original question 
). With help of a colleague who found this post https://discuss.cubepilot.org/t/how-to-activate-dfu-mode-on-cube-orange/12704/5 we manage to find that the Here4 comes with a ST-LINK(JTAG/SWD) port and pads, located on the upper left side on the bottom part of the board. We then connected it to a ST-LINK v2 and using STM32Programmer we flashed the firmware and bootloader from https://github.com/CubePilot/GNSSPeriph-release/releases/tag/v1.14.4, did a power cycle and the device regained functionality.
Though the issue is solved, do you still remember which firmware you were using previously? You shouldn’t have to restart the node after updating. Is there any lights before you restart the node?
We were using the previous release, the 1.14.3. When restarted, the device LEDs glowed with white and flashed slowly, giving the impression that it was locked at bootloader and that the application part wasn’t starting.